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The Bard S538-215 FAD assembly is an OEM fresh air damper service assembly used on Bard wall-mount HVAC equipment to manage controlled outdoor air intake through the factory vent option opening, helping maintain proper ventilation without sacrificing dependable unit operation. When an existing damper is damaged, sticking, or leaking air, replacing it with the correct Bard OEM assembly restores intended airflow control and improves consistency in comfort and building pressure. Because vent and damper configurations vary by unit series and cabinet size, confirm compatibility by matching the part number S538-215 to your Bard model and the ventilation option shown in the unit literature before ordering.